troubleshooting Question

mailbox database.edb and a sum of totalitemsize output difference

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irinadruker asked on
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My Exchange 2007 server  has mailbox database.edb   file, that is  137 GB in size
If I pull  the report by running a command " Get-MailboxStatistics -Database “Mailbox Database” | Select DisplayName,  TotalItemSize | Export-CSV.." , then summarize TotalItemSize for all mailboxes, I am getting   160 GB number.  Several days ago it was 172 GB, but after the users ran some cleanup the size reduced to 160 GB. The size ofa  mailbox database.edb file  still is growing though.

Could anybody help me to figure out why there is a difference between the  size of mailbox database.edb file and a sum of all TotalItemSize items.

Thank you
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